Math Crossword puzzle

1234567891011121314151617181920
Across
  1. 4. angle An angle which measures below 90.
  2. 5. number A number greater than zero.
  3. 8. triangle A triangle containing only acute angles.
  4. 10. An expression in algebra that consists of two terms
  5. 13. parts per 100. The symbol is %
  6. 14. A three-sided closed figure. It contains three angles that when combined the sum equals 180.
  7. 16. An expression in algebra which consists of three terms.
  8. 19. part of a whole.
  9. 20. The amount which can be held, as measured in cubic units. The volume of a rectangular prism = length times width times height.
Down
  1. 1. A symbol that stands for a number.
  2. 2. angle An angle which is larger than 90 but less than 180.
  3. 3. splitting into equal parts or groups. It is the result of "fair sharing".
  4. 6. number An integer or fraction such as 7/7 or 9/4 or 5/1. Any number that can be written as a fraction x/y with x a natural number and y an integer.
  5. 7. (in its simplest form) repeated addition.
  6. 9. common factor The largest factor that is common to two or more numbers.
  7. 11. notation A number between 1 and 10 and multiplied by a power of 10. Used for writing very large or very small numbers.
  8. 12. A group of objects, numbers, etc.
  9. 15. To combine terms into fewer terms.
  10. 17. An expression in algebra that consists of only one term.
  11. 18. number A number that can be divided by only itself and one.